SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Contract assets in accounts receivable, Net	$ 9.8		$ 9.8		$ 0.0
Contract liabilities in deferred revenue	183.4		183.4		$ 0.0
Revenue	473.2	$ 119.6	881.0	$ 223.5
Bill and hold products
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Revenue	$ 0.0	$ 0.6	$ 0.0	$ 1.2

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details